Android Studio gets "Must Implement OnFragmentInteractionListener"

Question

I get a cast that says: "Must implement OnFragmentInteractionListener, and I already have it ...

I looked at every question asked here, and no one helped me.

Can anyone help me out?

ERROR:

FATAL EXCEPTION: main Process: com.example.android.navigationdrawer, PID: 5916 java.lang.RuntimeException: com.example.android.navigationdrawer.MainActivity@3aefae64 must implement OnFragmentInteractionListener at com.example.android.navigationdrawer.FragmentCamera.onAttach(FragmentCamera.java:83) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1019) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5930) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) 

MAINACTIVITY (extension to OnFragmentInteractionListener)

 package com.example.android.navigationdrawer; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.NavigationView; import android.support.design.widget.Snackbar; import android.support.v4.app.Fragment; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.ImageView; import android.widget.Toast; public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, FragmentCamera.OnFragmentInteractionListener { 

MAINACTIVITY (FragmentCamera @Override)

 @Override public void onFragmentInteraction(Uri uri) { } 

MAINACTIVITY (ONCREATE)

 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); ActionBarDrawerToggle toggle = new ActionBarDrawerToggle( this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); drawer.setDrawerListener(toggle); toggle.syncState(); NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); navigationView.setNavigationItemSelectedListener(this); } 

MAINACTIVITY (TRANSFER OF FRAGMENTS)

  boolean FragmentTransaction = false; Fragment fragment = null; //Camera if (id == R.id.nav_camera) { Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); startActivity(intent); ImageView mImageView = (ImageView) findViewById(R.id.Galley1); //Galley } else if (id == R.id.nav_gallery) { fragment = new FragmentCamera(); FragmentTransaction = true; } 

...

  if(FragmentTransaction) { getSupportFragmentManager().beginTransaction() .replace(R.id.drawer_layout, fragment) .commit(); item.setChecked(true); getSupportActionBar().setTitle(item.getTitle()); } 

FRAGMENTCAMERA

 package com.example.android.navigationdrawer; import android.content.Context; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; /** * A simple {@link Fragment} subclass. * Activities that contain this fragment must implement the * {@link FragmentCamera.OnFragmentInteractionListener} interface * to handle interaction events. * Use the {@link FragmentCamera#newInstance} factory method to * create an instance of this fragment. */ public class FragmentCamera extends Fragment { // TODO: Rename parameter arguments, choose names that match // the fragment initialization parameters, eg ARG_ITEM_NUMBER private static final String ARG_PARAM1 = "param1"; private static final String ARG_PARAM2 = "param2"; // TODO: Rename and change types of parameters private String mParam1; private String mParam2; private OnFragmentInteractionListener mListener; public FragmentCamera() { // Required empty public constructor } /** * Use this factory method to create a new instance of * this fragment using the provided parameters. * * @param param1 Parameter 1. * @param param2 Parameter 2. * @return A new instance of fragment FragmentCamera. */ // TODO: Rename and change types and number of parameters public static FragmentCamera newInstance(String param1, String param2) { FragmentCamera fragment = new FragmentCamera(); Bundle args = new Bundle(); args.putString(ARG_PARAM1, param1); args.putString(ARG_PARAM2, param2); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { mParam1 = getArguments().getString(ARG_PARAM1); mParam2 = getArguments().getString(ARG_PARAM2); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_camera, container, false); } // TODO: Rename method, update argument and hook method into UI event public void onButtonPressed(Uri uri) { if (mListener != null) { mListener.onFragmentInteraction(uri); } } @Override public void onAttach(Context context) { super.onAttach(context); if (context instanceof OnFragmentInteractionListener) { mListener = (OnFragmentInteractionListener) context; } else { throw new RuntimeException(context.toString() + " must implement OnFragmentInteractionListener"); } } @Override public void onDetach() { super.onDetach(); mListener = null; } /** * This interface must be implemented by activities that contain this * fragment to allow an interaction in this fragment to be communicated * to the activity and potentially other fragments contained in that * activity. * <p/> * See the Android Training lesson <a href= * "http://developer.android.com/training/basics/fragments/communicating.html" * >Communicating with Other Fragments</a> for more information. */ public interface OnFragmentInteractionListener { // TODO: Update argument type and name void onFragmentInteraction(Uri uri); } } 

If you need another code, comment, and I will add it!

thanks for the help

Answer 1

Remove the onAttach method from your fragment, then everything will be fine.